Shock-absorber mechanism



G. H. IRWIN.

SHOCK ABSORBER MECHANISIVI.

APPLICATION man JUNE I3, 1919.

1,417,918, f Patented May30,1922.

e jim/mo@ 9. M7" "W- G. H. IRWIN. I SHOCK ABSORBER MECHANISM.

APPLICATlON FILED 1UNEI3. |919.

1,41 7,918. Patented my 3o, 1922..

4 SHEETS-SHEET 2.

if j" IN VEN TOR.

A T'TORNEYS.

G. H. IRWIN.

SHOCK ABSORBER MECHANISM.

APPLICATION man JUNE I3, 1919.

1,417,911 8. Patented May 30, 1922.

4 SHEETS-SHEET 3.

INI/ENTOR. l

G. H. IRWIN.

SHOCK ABSORBER MECHANSM.

APPLICATION F1150 11111E13, 191.9.

1,417,918. Patented May 30, 1922.

4 SHEETS-SHEET #1..

l .Nl/'EN TOR.

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1.9.; l annular Hang@ Whgg m QM., :f1 extend 111m threadedl engagement with the lower part, 18 ot the cylinder member.y springs 33 being` interposed between the flange and the serew heads so that when the serews are turned down, tluI parking material will be put under compression and any contraction or wear thereot immediately' taken up. rThe upper part 19 of the cylinder member has the 1nternal annular flange 34 for aligning the upper end. ot the stutting gland so that such gland together with the paeking and the Vlower end of the part 18 form a trueeylinder in which the piston structure run easily reciprocate. The Side of the stuffing gland is eut away suflieiently to leave the elearance opening 35 for the endiof the vehicle spring when such spring forces the piston struct-ure downwardly in the eylinder member.

lust below the spring receiving pin j), a partition 36 extends across the piston strueture which is continuous exeept for the passageways 37 therethrough. is provided to elose the passageways. the dise being above the partition and seeured tothe valve stem 39. the spring 40 interposed between the head ot' the stern and the partition tending to hold the dise 3H in position to close the passageways.

Reeiproeable within the piston strueture 27,Which l will eall the main piston .strueture, is what I will eall a floating piston structure designated as a whole by 41l and Comprising the cylindrical shell 42 and the transverse wall 43, the shell having intimate bearing engagement with the main piston structure. lVithin the piston strueture and interposed between the walls Ilo aud 43 thereot'. is the helical Compression spring 44. while between thi wall 43 ot the floating piston and the' bottom wall ot' the'part 1H. is interposed the helieal eompression spring 45, the spring -l-: being shorter and heavier than the spring 44.

The wall Lvlll has a puniber ot' large passageways 46 therethrough whieh are nor` mally eovered by a valve disr 4T through which are restrieted passageways 4H. A spring 49 interposed between the valve dis(l and the head-otl the stein 5() extending i'roni the wall 43. tends to hohl the valve in position to elose thel large passageways 4b. 'l`he lower part of the yliiider member is filled with fluid sueh as oil. the line w showing the Huid level, while the spzu-eibetween the oil and the wall t is normally filled with air. `When the piston strueture is i'oreed downwardly. the air will be eompressed and will fmf'e the 'valve ltw' t'roui its seat and esi-ape through the passage\vays T 'When the piston is shifted upwardly. the spring 4l) will elose the valve .",H to.shut oilI the passageways 37.A 51 represents a Irv-pass whieh inay be provided through the wall lti I'or air. means` sut-h as a plate 5L serving for opening A. valve'dise 25H.

bww @ma coef said passageway to any degree, The size of the passageway determines the rapidity of upward movement otf the pistou t'or the larger 'the passageway. the faster air ean flow into the piston strueture. 'lhe ring 53 supported on the annular shoulder 54 ot' the upper traine part ll) is ot fiber or other rushioninglvL material whieh will eushion thi-"iinpaet ot' the pistop strurture.

During travel of a vehicle. the large rantilever springs. will take up the more intense shot-ks but the shoek absorber deiviees will tal-:e up and absorb the short rapid-ly repeated 'shocks or vibrations. For eaeh upward impulse against the rear end ot' the spring, the'spring will be Canted and its front end swung downwardly. with sueh downward movement ot' the spring end. the piston strueture 27 is shifted downwardly and the springs 44 and y45 are compressed. Thus smaller shocks are taken up by the eanting of the eantilever springs and the eompression of the shock absorber springs and none ot the shot-lc is eommunieated to the vehiele body. Even tor larger obstruction.7 the tirst, impact is taken up to a eonsiderable extent by the shot-lc absorber devires. and the blow is thus gradually rommunicated to the vehiele body instead ot abruptly. The shock absorber deviee itself applies its spring resistanee gradually. for the light. longer spring 44 is first eoinpressed. and later the heavier spring 45 is -rompressed.

When the piston structure is shit'ted downwardly in the eylinder member. the air within the piston strueture is compressed lult esrapes through the valve passageways 3T. The floating piston strueture -ll is also foreed downwardly and pressure is applied to the oil below it. but; the pressure raises the valve dise 4T and the oil iiows'i'hrough pasligeways 4t?. l'hus. thereis nothing to hinder the-shoeh absorber springs troni being compressed. llowever. upward movement of the. piston lstrut-ture is-retarded. so that sudden rebound o' the vehirle springs is prevented. ;\s soon as downward pressure ou the piston struetures is withdrawn. the springs -l-Jf and 45 tend lo expand. However. inunediatel'y upon sueh expansion the pistou struetures will tend to rise The spring ll having been eoiupressed a greater distanee than the spring l5 will tend to shil't the piston strueture' upwardly t'aster than the floating piston striu'turebut the air valve 3H being elosed, surh iuoveiuent' will be resisted. :is any relative uiovenient between the pistou sti'uetures tending to separate thein when the valve 3H is rlosed will r'ause reduelion ol' the pressure within the pistou strueture below the air pressure against the outside ol' 'the wall Ilo. .\s soon as the spring l5 expands and raises the lloaling pis ton strueture. pressure will be exerted lll() *mrs su Hunt E! dan The Leg-Tee @i muni' o? lz the Honing; by the plm@ i-, pass .'31. The unirse. @pel'a During 013 1S of air stroke of "dm plstim when the swing and the Huw m u ways 45%, "h:

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fev/Q in w" me stu wir@ being' romxacem bj A A l x h@ Space. hamm-m Hw im 3l i "i 11mm 'n the ggf-1x mal .mwN-wn l.) the :he mem ibis f: absorber aa id m n (EN www :md n am Hwa Suid im 1 smid xpanf.

tarhnint lo a vrliirle body and baring a ber is shifted downwardhY but to retard the Side opening near itS top for the entrance flow oi' fluid when the floating piston meinof a `Lhiele Spring. a main piston member ber is shifted nlnvardly. cizproeable within said cylinder member 4.' In a Shock absorber derive olf tb(l la 25 5 and adapted lor ronnection at its upper described, the vcombination ol' a r-'rlindriral end with the vehicle spring, a floating piston enrlosnre member. a hollow piston sti-urtare memberreriln'orablewithin-said main piston telescopintr into said enrlosnre strnrtnnl member, a light (-onipression springr between troni the top thereof. said piston stl-urtare said floating' piston member and the end of beingadapted 4for ronnertion at its upper 30 10, said main piston memberi a heavier 'oi11pres- Aend with 'a Vehirle sprintf. a floating piston sion spring between Said floating piston reriprm'able within said niain piston and memberainl the bottom of said rylindn' inning valve rontrolled passageway lin-ri .member` fluid in said cylinder member and through, a light rornpresaion spring"` beair in said main piston member. a check tween Said main piston structure and the 35 l5 valve in the end oi said main piston memfloating piston sti-urtare. and a heavy comv be adapted to permit the expulsion of air pression spi-iin;r betweensaid floating' piston but to resist the inflow of air to said main and the bottoni ot'said enrlosnre strat-(nre. 'piston member, a check valveit'or said tloatln witness whereof. l hereunto snbsrribv .ing piston member adapted to permit nnmy naine this 9th daiY of June. I). 1919. 40

20' restricted flow of tlnid lro'in below to above said floatingV piston member when said Inemit GEORGE ll. ll-llVlN 

